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In previous work, we demonstrate a simple approach to creating a plasmonic polymer. Reflecting upon the need for
greater spot density while still maintaining the objective of low cost analysis, the next generation of device is described
where density up to 24000 sensing spots is achievable. A localized surface plasmon micro-array is described formed by
single or multiple deposition of a nanorod plasmonic polymer by micro-contact printing. The structure of the polymer
can be made micro-porous and thickness can be controlled by a cyclical deposition and rapid heat cure protocol. The
consistency of feature deposition is assessed. The resulting micro-structure provides a large surface area for
immobilization of biomolecules for assay development. Dark-field analysis of the polymer demonstrates complex
microstructure and intense Mie Scattering as expected from gold nanorods. Using fluorescence confocal analysis images
of the polymer demonstrates two independent photo-luminescent emission spectra. The two independent emission
spectra are linked to the positions of the localized surface plasmons of the nanorods, using a pump source of 543nm
excites the transverse plasmon (peak at 550nm)and it's commensurate emission, but doesn't excite the longer emission
around 700nm that is linked to the longitudinal Plasmon around 737nm. The different emissions are demonstrated in the
illumination of different portions of the polymer matrix under each pump source excitation. The potential for multiple
spectroscopic biosensor analysis is discussed.
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Philip J. R. Roche, Songzhe Wang, Maurice C. K. Cheung, Vamsy P. Chodavarapu, Andrew G. Kirk, "A nanorod polymer micro-array formed by micro-contact printing," Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310O (2 February 2012); https://doi.org/10.1117/12.910142